1. Thick Thin Inner PadFAST SF ultrahighstrength helmet lining provides two different types of inner pads, allowing users to ly combine the inner pads according to their own head shape and needs to ensure the fit and comfort for your head. 2. Protective PadThis helmet lining is made of ultrahighstrength material, which effectively provides extra protective padding and protects your head all around. Whether you are doing sports, riding or doing other outdoor activities, you can enjoy it with confidence. 3. Replacement and Repair: FAST SF helmet linings come with a complete product set, including a lining set. If the lining is worn or needs to be replaced, you can easily repair and replace it. So you extend the life of the product and keep your helmet in good condition at all times. 4. Easy to use: Thanks to careful design, FAST SF ultrahighstrength helmet pads are very easy to use. All you need to do is install the pads properly in the helmet and then enjoy excellent comfort and stability, without complicated steps or tools, timesaving and convenient.